On Thermo- and Photo-Induced Symmetry-Broken Transformation in Spin-Crossover Complex: Cooperative Activation
-
- Luty Tadeusz
- Institute for Molecular Science Institute of Physical and Theoretical Chemistry, Centre for Advanced Materials and Nanotechnology, Wroclaw University of Technology
-
- Yonemitsu Kenji
- Institute for Molecular Science
Search this article
Description
We study energetics of a cooperative low-spin (L) to high-spin (H) transformation in a crystal with two sublattices, where thermo- and photo-induced symmetry-broken phases have been recently observed. The model takes into account an intra-dimer antiferromatic coupling and inter-dimer couplings. Cooperative activation processes for switching between LH and HL states and that from LL to HH states of a dimer are analyzed. It is shown that locally (within a dimer) preferred symmetry-broken, LH and HL, states compete with inter-dimer couplings, which stimulates dynamical disorder via a decrease in the energy barrier for a flip between asymmetric configurations. On the other hand, a locally non-preferred symmetric state (HH) is supported by inter-dimer interaction via a cooperative activation mechanism. We conclude that symmetry-broken states can form an intermediate thermo-induced phase or can be observed as a photo-induced one at low temperatures as a result of local equilibrium. The global equilibrium follows from cooperative interaction and governs the thermo-induced re-entrant phase transition.
Journal
-
- Journal of the Physical Society of Japan
-
Journal of the Physical Society of Japan 73 (5), 1237-1243, 2004
THE PHYSICAL SOCIETY OF JAPAN
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390282679163117824
-
- NII Article ID
- 210000104808
- 110001954839
-
- NII Book ID
- AA00704814
-
- BIBCODE
- 2004JPSJ...73.1237L
-
- ISSN
- 13474073
- 00319015
-
- NDL BIB ID
- 6940803
-
- Text Lang
- en
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed